Ironic is now disabled by default in the overcloud. This brings Kayobe's
default set of services into line with Kolla Ansible. For environments
using Ironic in the overcloud, set kolla_enable_ironic to true in
kolla.yml.
Story: 2008207
Task: 40991
Change-Id: I33eb4fa534847e199a599350b525d4762a2beaac
